EQ7 Series Instruction Manual - TECO-Westinghouse Motor Company

E34, E35 Overload Early Warning/Current Detection (Level and Timer)
E37, F38 (Current Detection 2/Low Current Detection (Level and Timer))
E55, E56 (Current Detection 3 (Level and Timer))
These function codes define the detection level and time for the "Motor overload early warning" OL, "Current
detected" ID, "Current detected 2" ID2, "Current detected 3" ID3, and "Low current detected" IDL output signals.
Output
signal
Data assigned
to output
terminal
Operation level
Range
Timer
Range: 0.01 to
600.00 s
Motor
characteristics
Range
Thermal time
constant
Range: 0.5 to 75.0
min
OL 7 E34 - F10 F12
ID 37 E34 E35
ID2 38 E37 E38
ID3 39 E55 E56
- -
IDL 41 E37 E38
- Data setting range
Operation level: 0.00 (Disable), 1 to 200% of inverter rated current
Motor characteristics 1: Enable (For a general-purpose motor with shaft-driven cooling fan)
2: Enable (For an inverter-driven motor, non-ventilated motor, or motor with
separately powered cooling fan)
• Motor overload early warning signal -- OL
The OL signal is used to detect a symptom of an overload condition (alarm code 0l1 ) of the motor so that the user
can take an appropriate action before the alarm actually happens.
The OL signal turns ON when the inverter output current exceeds the level specified by E34. In typical cases, set
E34 data to 80 to 90% against F11 data (Electronic thermal overload protection for motor 1, Overload detection
level). Specify also the thermal characteristics of the motor with F10 (Select motor characteristics) and F12
(Thermal time constant).
• Current detected, Current detected 2 and Current detected 3 -- ID, ID2 and ID3
When the inverter output current exceeds the level specified by E34, E37 or E55 for the period specified by E35,
E38 or E56, the ID, ID2 or ID3 signal turns ON, respectively. When the output current drops below 90% of the
rated operation level, the ID, ID2 or ID3 turns OFF. (The minimum ON-duration is 100 ms.)
• Low current detected -- IDL
This signal turns ON when the output current drops below the level specified by E37 (Low current detection, Level)
for the period specified by E38 (Timer). When the output current exceeds the "Low current detection level plus 5%
of the inverter rated current," it goes OFF. (The minimum ON-duration is 100 ms.)
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